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01Magnet rotors

In the past magnetic rotors have been produced in several complex consecutive production processes. Magnetic rings have been produced and in a second production step glued with the shaft. Additionally, according to the customer‘s requirement, a bursting protection, by a stainless steel bushing has been shrunk or glued on the magnets.

Thanks to our new production technique, it is now possible to unify all production steps in only one work step.

Potential applications

For rotors that operate at high speed, e.g. vacuum cleaner motors required to comply with the new energy efficiency class A***.

Magnetic properties

Material NdFeB 72/70 pw

Isotropic

Remanence typ. 700 mT

Magnetization possible on cicumference

Binder approx. 2 % Epoxy

Important properties

Other important properties see into the following table.

Components:

Stainless steel sleeve with a wall thickness of 0.2 mm

Ring magnet made from NdFeB magnetic material

Spindle or iron core

Production process:

Pressing the ring magnet and joining it in the sleeve in a single step

Joining the spindle with the iron core in the magnet ring, which is not yet cured

Curing of the epoxy

Magnetisation of the complete assembly

Advantages of the new process:

no adhesive bonds

no adhesive gap and therefore less imbalance

no additional cost for gluing

more efficient production because the complete assembly "magnet joined in a sleeve with spindle" can be produced in one step

low use of magnetic material since wall thicknesses of up to 1.5 mm can be implemented

high degree of automation possible

motor speeds of more than 50,000 rpm are possible

the magnets can be enclosed well in the stainless steel sleeve

joining magnets into pans is also an option

Advantages of the magnetic material:

Magnetic alloy without dysprosium

simple manufacturing process and high precision of the magnets since they are not sintered